Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Concord, CA
No earthquake was likely felt in Concord in the 24 hours to 8:31 pm PST (04:31 UTC). The last one was M 2.1, 5 km (3 mi) SW, at 4:05 am PST on 8 November 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Concord
This page: a magnitude 1.5 earthquake was recorded 2 km (1 mi) south of Concord, CA, at 2:16 am PDT on 22 October 2024 (09:16 UTC), 10 km deep.
USGS: 2 km WSW of Concord, CA
in Concord, CA
- When
- 2:16 am PDT on 22 October 2024 ()
- Where
- 2 km (1 mi) south of Concord, CA · earthquakes near Concord
- Magnitude
- M 1.5 (md)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 8 km ESE
- Nearest mapped fault
- Concord fault, 2 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 749 days ago
Earthquake alerts for Concord, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 2 km (1 mi) from the epicentre. In Concord, 2 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Likely felt in: Concord 2 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
- Around the size people start to feel M 3.0 160× the energy of this one
- This earthquake M 1.5 about 5.9 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 4.5 on 2019-10-15 — about 25,000 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 37 km NW of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 27 km ESE of this epicentre
- 5.4 South of Elmira, California · 40 km NNE of this epicentre
- 5.4 9 km NE of Livermore, California · 37 km SE of this epicentre
- 5.1 11 km E of Blackhawk, California · 28 km SE of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 37.9592, -122.0328. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 8 km (5 mi) | ESE | earthquakes near Contra Costa County |
| Solano County, CA | 35 km (22 mi) | NNE | earthquakes near Solano County |
| Alameda County, CA | 36 km (23 mi) | SSE | earthquakes near Alameda County |
| Marin County, CA | 63 km (39 mi) | W | earthquakes near Marin County |
| Napa County, CA | 66 km (41 mi) | NNW | earthquakes near Napa County |
| San Joaquin County, CA | 67 km (41 mi) | E | earthquakes near San Joaquin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
41 earthquakes have been recorded within 50 km since this one.
- 1.7 7 km E of Black Point-Green Point, CA
- 2.2 2 km ENE of Discovery Bay, CA
- 2.0 5 km SSE of Napa, CA
- 1.8 7 km ENE of Black Point-Green Point, CA
- 1.5 5 km NW of American Canyon, CA
- 1.6 3 km SW of Clayton, CA
- 1.9 3 km SSW of Concord, CA
- 1.7 2 km NW of Concord, CA
- 2.1 1 km NW of Concord, CA
- 3.5 2 km ENE of Pleasant Hill, CA
- 1.9 1 km ENE of Discovery Bay, CA
- 2.4 12 km SSE of Suisun City, CA
- 1.6 5 km E of Vallejo, CA
- 2.1 2 km NW of Castro Valley, CA
- 3.0 6 km SW of Clayton, CA
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.